Pectobacterium carotovorum

Pectobacterium carotovorum is a bacterium of the family Pectobacteriaceae; it used to be a member of the genus Erwinia.[1]

Pectobacterium carotovorum
Slime flux on a Camperdown elm caused by Pectobacterium carotovorum
Scientific classification
Domain:
Bacteria
Phylum:
Proteobacteria
Class:
Gammaproteobacteria
Order:
Enterobacterales
Family:
Pectobacteriaceae
Genus:
Pectobacterium
Species:
P. carotovorum
Binomial name
Pectobacterium carotovorum
(Jones, 1901) Waldee, 1945
Synonyms

Erwinia carotovora

Soft rot in an onion caused by Pectobacterium carotovorum or Dickeya dadantii.

The species is a plant pathogen with a diverse host range, including many agriculturally and scientifically important plant species. It produces pectolytic enzymes that hydrolyze pectin between individual plant cells. This causes the cells to separate, a disease plant pathologists term bacterial soft rot. Specifically, it causes beet vascular necrosis and blackleg of potato and other vegetables (hence the name carotovora – "carrot-eater"), as well as slime flux on many different tree species.[1] Currently, there are four described subspecies of P. carotovorum (carotovorum, brasiliense, odoriferum, and actinidiae).[2]

This bacterium is a ubiquitous plant pathogen with a wide host range (carrot, potato, tomato, leafy greens, squash and other cucurbits, onion, green peppers, African violets, etc.), able to cause disease in almost any plant tissue it invades. It is a very economically important pathogen in terms of postharvest losses, and a common cause of decay in stored fruits and vegetables. Decay caused by P. carotovora is often referred to as "bacterial soft rot" though this may also be caused by other bacteria. Most plants or plant parts can resist invasion by the bacteria, unless some type of wound is present. High humidity and temperatures around 30 °C favor development of decay. The cells become highly motile near this temperature (26 °C) when fructose is present.[3] Mutants can be produced which are less virulent. Virulence factors include: pectinases, cellulases, (which degrade plant cell walls), and also proteases, lipases, xylanases, and nucleases (along with the normal virulence factors for pathogens – Fe acquisition, LPS integrity, multiple global regulatory systems).

Management

KENGAP, partners of the CABI-led programme, Plantwise have several recommendations for the management of P. carotovora including; washing hands and disinfecting tools regularly during and after harvestin, avoiding harvesting in warm and moist conditions. They also recommend frequent irrigation during head formation should be avoided to allow heads to dry and planting on ridges, raised beds or well drained soils prevents water logging around the plants.[4]

Plantwise partners also recommend thorough washing and disinfection of crates for to prevent post-harvest losses and that crop rotation with leguminous crops and cereals is practiced.[4][5]

Sources

 This article incorporates text from a free content work. Licensed under CC-BY-SA License statement/permission on Wikimedia Commons. Text taken from Plantwise Factsheets for Farmers: Bacterial Soft Rot on Brassica, KENGAP Horticulture, CABI. To learn how to add open license text to Wikipedia articles, please see this how-to page. For information on reusing text from Wikipedia, please see the terms of use.

 This article incorporates text from a free content work. Licensed under CC-BY-SA License statement/permission on Wikimedia Commons. Text taken from PMDG: Bacterial soft rot on cabbage, Jonathan M. Gekone (MOALF), Stephen Koech (KALRO) and Miriam Otipa (KALRO), CABI. To learn how to add open license text to Wikipedia articles, please see this how-to page. For information on reusing text from Wikipedia, please see the terms of use.

References
  1. Toth, Ian K.; Bell, Kenneth S.; Holeva, Maria C.; Birch, Paul R. J. (1 January 2003). "Soft rot erwiniae: from genes to genomes". Molecular Plant Pathology. 4 (1): 17–30. doi:10.1046/j.1364-3703.2003.00149.x. PMID 20569359.
  2. Li, Lei; Yuan, Lifang; Shi, Yanxia; Xie, Xuewen; Chai, Ali; Wang, Qi; Li, Baoju (2019). "Comparative genomic analysis of Pectobacterium carotovorum subsp. brasiliense SX309 provides novel insights into its genetic and phenotypic features". BMC Genomics. 20 (1): 486. doi:10.1186/s12864-019-5831-x. ISSN 1471-2164. PMC 6567464. PMID 31195968.
  3. Aizawa, Shin-Ichi (2014). "Pectobacterium carotovorum — Subpolar Hyper-Flagellation". The Flagellar World. Elsevier. pp. 58–59. doi:10.1016/b978-0-12-417234-0.00018-9. ISBN 9780124172340.
  4. "Plantwise Knowledge Bank | Bacterial Soft Rot on Brassica". www.plantwise.org. Retrieved 2020-06-10.
  5. "Plantwise Knowledge Bank | Bacterial soft rot on cabbage". www.plantwise.org. Retrieved 2020-06-10.

Further reading
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